David, have you tried any of the 'moisteners' like Stoppers 4, Oasis Moisturizing Mouth Spray, or the Biotene Oral Balance Liquid? Brian likes the Biotene and says it allows him to lecture for 2 hours at a time without any problems. There's another one called 'Numoisyn' but I haven't tried that. They all help to some degree, but I still need to carry a small bottle of water everywhere I go.